body {
    margin: 0;
    padding: 0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-color: rgba(255, 255, 255, 0.8); /* 全局背景透明度80% */
    background-blend-mode: multiply; /* 确保透明度效果生效 */
}

input, button, textarea {
    background-color: rgba(255, 255, 255, 0.6); /* 输入框和按钮透明度40% */
    padding: 10px;
    border: 1px solid #ccc;
    font-size: 16px;
    z-index: 1; /* 确保元素显示在背景前 */
}
